Thực hiện phép tính: a) 17 – 25 + 55 – 17 b) 25 – (-75) + 32 – (32 + 75) c) (-5).8.(-2).3 d) (-15) + (-122) e) (7 – 10) + 3 f) |-127| – 18.(5 – 6)
11
14/08/2024
Thực hiện phép tính:
a) 17 – 25 + 55 – 17
b) 25 – (-75) + 32 – (32 + 75)
c) (-5).8.(-2).3
d) (-15) + (-122)
e) (7 – 10) + 3
f) |-127| – 18.(5 – 6)
Trả lời
a) 17 – 25 + 55 – 17
= (17 – 17) + (-25 + 55)
= 0 + 30
= 30
b) 25 – (-75) + 32 – (32 + 75)
= 25 + 75 + 32 – 32 – 75
= 25 + (75 – 75) + (32 – 32)
= 25 + 0 + 0
= 25
c) (-5).8.(-2).3
= (-5).(-2).8.3
= 10.8.3
= 80.3
= 240
d) (-15) + (-122)
= -15 – 122
= -137
e) (7 – 10) + 3
= 7 – 10 + 3
= (7 + 3) – 10
= 10 – 10
= 0
f) |-127| – 18.(5 – 6)
= 127 – 18.(-1)
= 127 + 18
= 145
